.cesium-viewer,.cesium-viewer-cesiumWidgetContainer, .cesium-widget{
    width: 100%;
    height: 100%;
    margin: 0px;
    padding: 0px;
    overflow: hidden;
}

.cesium-widget canvas{
    width: 100%;
    height: 100%;
    margin: 0px;
    padding: 0px;
    overflow: hidden;
}